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<html lang="en">
    <head>
        <meta charset="UTF-8" />
        <meta http-equiv="X-UA-Compatible" content="IE=edge" />
        <meta name="viewport" content="width=device-width, initial-scale=1.0" />
        <title>Document</title>
    </head>
    <body>
        <script>
            let p = new Promise((resolve, reject) => {
                // resolve('ok');
                reject('error');
            });

            //指定回调   then 的链式调用
            p.then(v => {
                console.log(11);
            }, r => {
                console.log(22);
            }).then(v => {
                console.log(33);
            }, r=> {
                console.log(44);
            })
        </script>
    </body>
</html>
